Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat (2018) / Chapter Skim
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11 This chapter presents the experimental program of NCHRP Project 09-40A. The chapter includes a brief description of each pavement project, overlay construction activities, field experiment, and the laboratory characterization program.
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12 3.3.1 Missouri Project The Missouri DOT (MoDOT) project was located in Cape Girardeau County and consisted of four types of pavement surfaces: milled HMA, new HMA, existing HMA, and PCC on US 61, northbound MO 177, westbound US 61, and southbound MO 177, respectively.
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13 of an existing asphalt layer followed by placement of a thin leveling course (less than 0.25 in.) and then a 1.5-in.
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14 and 1.25-in. HMA overlay.
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15 3.4.1 Distributor Truck Calibration Proper tack coat application is highly dependent on properly calibrated application equipment. Before the day of tack coat application, calibration of the computerized tack coat distributor truck was performed in accordance with ASTM D2995 (Method A)
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16 3.4.2 Pavement Surface Texture Measurement Pavement surface macrotexture depth was measured before construction of the HMA overlays in accordance with ASTM E965, Standard Test Method for Measuring Pavement Macrotexture Depth Using a Volumetric Technique, a test commonly referred to as the sand patch test (70)
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17 typical calibration pad layout utilized in the field. The residual application rate was estimated for each type of tack coat by Equation 2.
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18 each overlay, site information was collected with the form presented in Figure A-2 in Appendix A 3.4.6 FWD Test In all field projects, nondestructive evaluation of each test section was performed with FWD testing equipment.
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19 recorded during FWD testing. Because FWD tests were performed in different seasons, the center deflection was corrected to 25°C on the basis of the model developed by Park et al.
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20 3.4.8.2 Rut Depth Measurements Rut depths within each test section were manually measured with either a straight edge or an A-frame, Figure 3.4-8 (b) , at 50-ft intervals in both outer and inner wheel paths.
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21 Traffic Direction (a)
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